I...would imagine that internet celebrities have just as much leeway to insult people as any of us do right now.
They're just people on the internet. They say all the stuff that we say. They just get more attention. If anything, that attention increases their accountability. If some random jacksock walks in here and tells us that Anita Sarkeesian molested him while wearing a Ghostbusters costume, the worst he gets is banned. He's not going to get hate mail. His career isn't in jeopardy.
Internet celebrities rely entirely on the goodwill of their viewers for their continued prosperity and fame. Every time they butcher one of gaming's sacred cows, they risk that goodwill. They have much more at stake than any of us do, as far as I'm concerned.
That doesn't mean Bob Chipman can't go to hell, though.